[messaging] Masking contact addresses with ECDH

[Tony Arcieri]

Sure, the original impetus for this was some discussion on the SimplySecure
Slack of having a protocol which did not require any direct interactions
between Alice and Bob for doing a private set intersection for contacts,
mediated through a third party (the directory)

On Monday, February 29, 2016, Joseph Bonneau <jbonneau at gmail.com> wrote:

>
>
> On Mon, Feb 29, 2016 at 12:38 PM, Tony Arcieri <bascule at gmail.com
> <javascript:_e(%7B%7D,'cvml','bascule at gmail.com');>> wrote:
>
>> On Monday, February 29, 2016, Joseph Bonneau <jbonneau at gmail.com
>> <javascript:_e(%7B%7D,'cvml','jbonneau at gmail.com');>> wrote:
>>
>>> I'm not sure exactly what the goal is here. Is it for Alice and Bob to
>>> find out which contacts they have in common without each revealing the
>>> whole set?
>>>
>>
>> Yes. Moxie did a great job of spelling out the problem and various
>> non-solutions here:
>>
>
>>  https://whispersystems.org/blog/contact-discovery/
>>
>
> That post describe the problem of Alice and Bob trying to find out if
> they're both using the same service. I asked if the goal is for Alice and
> Bob to find out which contacts they have in common without each revealing
> the whole set, which is a quite different proposition. It sounds from your
> original message like you were asking about this, since you mentioned "Bob
> is authorized in the directory to view Alice's contacts"
>
>

-- 
Tony Arcieri
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